facctors affecting internal resistance of cell/EMF of cell depends

factors affecting internal resistance of cell

Abstract
A silver molybdate glass with the mol% stoichiometry of 60AgI-20Ag2O-20MoO3 is prepared by liquid nitrogen temperature quenching of the melt. The glassy nature of the phase has been confirmed by powder X-ray diffraction. The conductivity of the glass from impedance spectroscopy is of the order 10−3 S cm−1 at 300 K. The phase is an electrolyte and has been used to fabricate several iodine/silver electrochemical cells in which silver is mixed in different proportions with the solid electrolyte for the anode of the cells. The cathode consists of a fixed ratio of iodine, electrolyte and carbon. It is found that, if the cathode disc is placed over the electrolyte surface of the anode/electrolyte disc and clamped between two copper current collectors, the cell with a 1:1 weight ratio of silver powder and the electrolyte shows the lowest internal resistance. A second cell has been fabricated with this anode composition, but the anode, electrolyte and cathode are pressed together to form a single solid disc so as to eliminate cathode/electrolyte interfacial resistance that also contributes to the total internal resistance of the cell. For the cells with a composition of 1:1 silver powder and electrolyte weight ratio, the internal resistance of the cell decreases from 2.3 kΩ when the cathode and anode/electrolyte layers of the cell are pressed separately to 0.15 kΩ for a cell with the anode, electrolyte and cathode pressed together. The value of 0.15 kΩ is in reasonable agreement with the bulk resistance of the electrolyte as obtained from the impedance plot.

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factors affecting internal resistance of cell

Abstract
A silver molybdate glass with the mol% stoichiometry of 60AgI-20Ag2O-20MoO3 is prepared by liquid nitrogen temperature quenching of the melt. The glassy nature of the phase has been confirmed by powder X-ray diffraction. The conductivity of the glass from impedance spectroscopy is of the order 10−3 S cm−1 at 300 K. The phase is an electrolyte and has been used to fabricate several iodine/silver electrochemical cells in which silver is mixed in different proportions with the solid electrolyte for the anode of the cells. The cathode consists of a fixed ratio of iodine, electrolyte and carbon. It is found that, if the cathode disc is placed over the electrolyte surface of the anode/electrolyte disc and clamped between two copper current collectors, the cell with a 1:1 weight ratio of silver powder and the electrolyte shows the lowest internal resistance. A second cell has been fabricated with this anode composition, but the anode, electrolyte and cathode are pressed together to form a single solid disc so as to eliminate cathode/electrolyte interfacial resistance that also contributes to the total internal resistance of the cell. For the cells with a composition of 1:1 silver powder and electrolyte weight ratio, the internal resistance of the cell decreases from 2.3 kΩ when the cathode and anode/electrolyte layers of the cell are pressed separately to 0.15 kΩ for a cell with the anode, electrolyte and cathode pressed together. The value of 0.15 kΩ is in reasonable agreement with the bulk resistance of the electrolyte as obtained from the impedance plot.